Drama where leads are like this

I am almost finished watching Ugly Alert, and I really loved the second couple there. 

Gong Hyeon Seok and Su Ju Yeong. 

I so want to watch another drama where I can find a couple like them! 

Bascially, the guy is such a workaholic, complicated and introvert person, and the female lead is opposite, she's cheerful, bright, simple, Innocent but cheeky.

She chases after him for a long time, always sit outside the Prosecutors Office to wait for him, even when he gets off work so late in the evening. She waits for him everyday even when he said he's feelings for her sister. 

She still doesn't give up, she comes everyday to annoy him, not always forcing her love on him, but she wants him to smile. And he begins smiling and talking more when she's with him.

They eat, walk and talk together, still he always reminds her that he'll never accept her love. Since he cant fall in love with a rich girl like her, while at the same time having feelings for her sister.

But he remains a gentleman as ever, while being cold and insensitive to her feelings.

She's always heartbroken at his coldness, but still never forgets to wait for him late at night. Over a long period of time, he also falls in love with her.  

There even comes a time when he begins liking her himself but still, doesn't realize it and thus, keeps hurting her feelings.

I know, story is kinda cliche, people say you can find it anywhere, but I just can't find more of this troupe anywhere.

Similar dramas I watched:

Smile, you 

Which Star are you from?

Second couple of My Golden Life 

Please, please, if anyone has seen ugly alert, they'll understand the reason of me asking for these recommendations! Thank you!

Try:

• Lover in Prague - i love this drama. One of tge reasons I began being such a fan of Jeon Doyeon, i love love her as Jaehee. RIP kim Joohyuk, still miss him as Sanghyun. 
• Laurel Tree Tailor Shop - story of Taeyang and Hyoyoung (side couple) plus the irritating but sometimes funny mom of Hyoyoung. 
• My daughter Sooyoung - Sangwoo and Hojung (side couple). HoJung is probably the but naive and slow than the females in the dramas you've mentioned but it definitely has the same scenario as ugly alert

 Czakhareina:

Try:

• Lover in Prague - i love this drama. One of tge reasons I began being such a fan of Jeon Doyeon, i love love her as Jaehee. RIP kim Joohyuk, still miss him as Sanghyun. 
• Laurel Tree Tailor Shop - story of Taeyang and Hyoyoung (side couple) plus the irritating but sometimes funny mom of Hyoyoung. 
• My daughter Sooyoung - Sangwoo and Hojung (side couple). HoJung is probably the but naive and dounced than the rrat of the females in the dramas you've mentioned but it definiteky has the same scenario as ugly alert

Thanks a lot! Laurel tree tailor shop has been on my watching list radar for so long! Really thanks! I'd love it if they turned out to be the one I want to watch right now!

My Daughter Seo Young has quite a bit of melodrama in it, but is not TOO heavy. Laurel Tree Tailors is very sweet and overall quite light on sad or melodramatic elements. Both are well worth checking out imo

 Little Cherry:

Thanks a lot! Laurel tree tailor shop has been on my watching list radar for so long! Really thanks! I'd love it if they turned out to be the one I want to watch right now!

The overall story and characterization of Laurel is not anywhere near ugly alert. But i have fun watching Taeyang and Hyowon (sorry missed up her name), they were the reason I watches the drama throigh and through. They were adorable. The mom will irritate you probably 90% of the time, but vy the ebd of it, i loved their threesome. Also this was the reason Lee Seyoung came in my radar, so hapoy with her recent success in her dramas... 

Also maybe check out:

• A Poem A Day
• Happiness / I am Bliss - though Kang Seok and Aeda was just so heartbreaking and tragic. They were still soooo sweet to watch. 
• Amateur Lovers Never Give Up - chihiro and hashimoto were somewhat in that type of characters though their circumstances are way different and moooore mature. But chihiro is soooo innocent i cant even grasp it... 

 Little Cherry:

Thanks a lot! Have you watched ugly alert? Also, is this drama really worth a try compared to ugly alert? Cause, Ugly Alert broke all the records, not only for me but for most of the audience also. So my expectations have unconsciously become high.

But, I want to give it a try since it looks good. Can you tell me are they the second couple in the drama? And really, really, thanks for the recommendation!

I've only finished 2 daily Dramas, so I can't compare YTHII to a daily Drama. It's a weekender, so it's runtime is much shorter than Ugly Alert. There's no real "lead" couple in YTHII, but the couple I mentioned are as close as the Drama has to a main lead couple.

Yeah, I also remember that tragic car accident where he died. Didn't see the cast of the drama until you mentioned, looks like I'll also have a hard time watching it. But since you told the plot so simply like that, it looks so interesting and I'm tempted to give it a try! Really thanks for being such a great help all this time.