FL moves on and starts afresh

Not quite but very close (FL is in a relationship with the SML who treats her badly and enemies to lovers story with the ML):

•  Reborn from the Ashes 
• Deep Love Love Again 
• What's Wrong with My Princess 

These might fit:

• As Beautiful as You 
• Best Choice Ever 
• Brocade Odyssey 
• In House Marriage Honey 
• Legally Romance 
• She and Her Perfect Husband 
• Pursuit of Jade 

 kabocha:

How important is it to you that the leads walk down the aisle at the end?  And how important is it that the FL have residual feelings to work through? Because I can think of a couple more dramas where the FL is initially dumped by the SML, and there's some initial hostility between the leads, 

It would be interesting to see them getting married in the middle. Even before they fall for each other. 

Mostly because having residual feelings for the past creates angst between the main couple. I like to see the angst love story. 

I would like you to recommend all those dramas, which you have in mind.

Basically I am missing the raw angst dramas. And FL being in love and taking time to move on and having hate to love genre actually gives me the angst I want to watch.

Or something like FL likes ML but she has the impression that he doesn't like her and gives up on the relationship. But ML has always liked her. Mostly like happening in high school/college days and then they meet after years. And we get to see a love story building up.

 Prasanthi SS:

Mostly because having residual feelings for the past creates angst between the main couple. I like to see the angst love story.

I would like you to recommend all those dramas, which you have in mind.

Basically I am missing the raw angst dramas. And FL being in love and taking time to move on and having hate to love genre actually gives me the angst I want to watch.

Or something like FL likes ML but she has the impression that he doesn't like her and gives up on the relationship. But ML has always liked her. Mostly like happening in high school/college days and then they meet after years. And we get to see a love story building up.

I hear you! You love watching the couple feel angst. It could be because one of them has mixed feelings, or they missed their timing, but you like for them to feel loss and longing and yearning. Is it correct to say that what you like is not as much conflict or anger as it is loss, sadness and regret?

That softens my recommendation for Shine On Me - there is some angst, but it's more about the couple creating a perfect, mutual love than it is about the FL's regrets for her college crush. Although in the first half of the drama, there are some flashbacks to the ML's past angst.

And it also means that I don't recommend Marriage Not Dating. It's a super cool drama, but it's very funny and upbeat. Despite the FL getting dumped in a lousy way, and several characters adulting in their mid-twenties, and some thorny parent marriages, it's solidly a romcom. Not enough angst.

I have a few recommendations based on couples going through angst. Not as many as someone who is truly into melodramas, though! But I share your joy in watching the couple suffer before they find their Happy Ever After.

It's still a yes on Another Miss Oh. Most of the characters experience emotional pain to a greater or lesser degree. They're also uncomfortable with themselves in some way, like there's a basic lack of ease. It's like things have gotten knocked out of true, and they have to struggle to find their path. Also, and I find this really interesting, the relationships are messier and more morally grey than is usual in kdrama. 

I also wholeheartedly recommend Something in the Rain, which has some powerful angst over the way rigid family roles, societal discrimination, and workplace harassment hurt the leads. Lots of dramas have leads that react to antagonists and misfortunes by being perfect or nearly perfect, and winning out over cardboard villains. But the leads of Something in the Rain are much more real than most kdrama characters,  and their obstacles are made of oppression rather than cardboard... and they struggle.

Secret Love Affair is another drama from the same director, Ahn Pan Seok. It's also a noona romance, but more melodramatic than Something in the Rain. This director does a really good job of showing how the age difference makes the couple vulnerable to discrimination and misfortune. The greatest source of angst in Secret Love Affair is that the FL lives in such a way that she has metaphorically sold her soul, and then she meets the ML, and he, by being who he is, makes her willing to pay the harsh price to redeem her soul. This is a haunting and bittersweet drama, and some of the FL's choices are irrevocable and painful.

It's Okay, That's Love has angst from how honest it is about the pain and suffering caused by mental illness and a society that has a terrible stigma against it. Most of the characters experience mental health challenges, and the challenges are not sugarcoated. The dialogue is wonderfully cutting, and the pace of the emotional ups and downs is dizzying. It's a great drama, very meaningful, and the characters go through a lot.

Should We Kiss First? is an excellent melodrama, and I think you would be into the way the leads' relationship starts out with dishonesty. You have to wait for the drama to reveal its hidden depths, but the FL from the beginning is a woman wrecked by a past terrible loss.

~~~~

Here are two that specifically address your description of "...happening in high school/college days and then they meet after years. And we get to see a love story building up."

Come and Hug Me has a marked slow motion longing vibe. The leads are star-crossed by the evil his father has wreaked on her family. He's survived his father and has taken a transformative path.  It's not my favorite drama, but then, melodrama is not my favorite thing. I think of it for you because the mood of yearning is beautiful.

Road Home also has a strong, sustained yearning mood. It's a second chance romance, and it emphasizes the flashbacks to their younger selves in pain over breaking up. It hits the regret and the yearning and the love - it's very focused and consistent about its themes.

Another drama that deals with two timelines, one where the leads are younger, one where they're older, is When My Love Blooms. I haven't seen it though, because, well, it's a melodrama. And I have resistance. But I keep watching clips. If you see it, let me know if it's as good as it looks?

Ah! You love Beyond the Clouds?!? Well, then I'm really not the best person to recommend dramas for you. I haven't seen any of the hardcore ktraumas of the Peak Hallyu Makjang era. I mean, I cried a lot watching and rewatching I Hear Your Voice, and the FL and the ML do have trauma, but it is nothing like the kind of drama you describe. The ML is a green flag, and the traumas are less hurtful to the relationship - it's a noona romcom with trauma piled on top. And I'm into Healer, where there's terrible trauma in the past, but the leads, while affected, have a very sweet romance. 

Is it valid to say that you want to see dramas where there is some level of makjang? By makjang I mean many crises, either emotional or situational. In a case of extreme makjang, things become nonsensically cliffhanger-y, while the other end of the scale isn't really makjang but more dark romance/thriller where all the crises make sense but are extreme.

I only know of ktrauma classics Secret Love, The Innocent Man, and Missing You by reputation, because I spent a few years at the height of my drama hyperfocus as the kind of nerd who hangs out on fan forums to read about dramas I will never watch but with which still want to have a vicarious hit of what it might be like If I were to watch them. But I really can't help you with the best match for Beyond the Clouds. My obsessive research habits have meant that I watched mostly the dramas I was meant to watch, without a lot of experimentation with genres that are never going to work for me. When I've watched a melodrama, it's mostly because of a strong recommendation from a friend, or because I was following a bias. I watched kdrama Mother for Lee Bo Young, and it's an amazing drama. But I couldn't have finished it except for Lee Bo Young.

At any rate, If I go through what I recommended to you earlier, filtering for a strong FL and complex emotions more on the side of loss, sadness, and regret, and a love story that develops within a traumatic situation, then here's how I rate what I recommended:

1. A tie between serious noona romances Something in the Rain and Secret Love Affair, because they have all those factors, but in a higher writing quality, more artistically accomplished package. Rather than the more obvious crises I hear Beyond the Clouds serves up, these two dramas situate the love story within the harmful and abusive behaviors of the people and institutions around them. Yet the leads aren’t insulated from the societal oppression. They aren’t the typical “perfect” leads who simply have nasty villains to overcome. Their identities are actually affected by what they experience.
2. I still think you might get something special out of Should We Kiss First? because even though the leads are older, their age and personal histories provide another way for you to experience your core interest in tortured relationships.
3. Even though Another Miss Oh lacks the sustained pathos of a drama like Beyond the Clouds, the love story does form within a tangled situation. I think of this drama as a sophisticated take on betrayal and bad karma in relationships. The adultery taboo is huge in Asian dramas, and there is no adultery in Another Miss Oh, but the tensions between the characters are similar to what people feel when adultery is committed, if that makes sense.

However, I’m doubtful about It's Okay, That's Love — even though it’s the supreme healing classic, I wouldn’t call the relationship tortured. It’s enemies to lovers, but there’s a reason it’s marketed in such an upbeat, romcom way, even though it’s profound and transformative. Despite its force and excellence, it’s just not the same kind of drama as Beyond the Clouds.

If it's helpful to you ... May I ask a bit about your empty Watchlist - are you new to Asian dramas except for having seen Beyond the Clouds? Or if you have seen some dramas, would you like to tell me a little about the Korean and Chinese dramas that you have seen? I'm not sure I have anything to offer, even knowing more, but I can try.

 Prasanthi SS:

What I want to watch in a love story drama is how two broken-hearted people come together and develop the love bond.

I understand. How important is it for there to be misunderstandings or blame between them? In Healer, in the scene where for a hot minute, it seems like the FL won't be able to handle the Suspected Father Murder thing, do you wish she had taken longer to come around?

 Prasanthi SS:

I like the angst developed in those circumstances. And Healer couple is one of my favorite couples. I have been watching Korean dramas for quite some time now.

Ahhh, I love bonding over Healer! Such a lovely drama! How does the level of angst between the couple strike you? Was Healer so awesome in other ways that you didn't pay much attention to the angst level, or was it angsty enough for you?

 kabocha:

I understand. How important is it for there to be misunderstandings or blame between them? In Healer, in the scene where for a hot minute, it seems like the FL won't be able to handle the Suspected Father Murder thing, do you wish she had taken longer to come around?

Ahhh, I love bonding over Healer! Such a lovely drama! How does the level of angst between the couple strike you? Was Healer so awesome in other ways that you didn't pay much attention to the angst level, or was it angsty enough for you?

No. There are some dramas where I don’t want to see misunderstandings. 

Healer is such drama for me where I liked both the characters, their love story, and their chemistry. The characters already had baggage especially FL so I didn’t want to see any misunderstanding.