Drama recommendations

Cool request! I see we both enjoyed (I more than you, but still) Love Like the Galaxy, so hopefully we have some tastes in common! It was the first drama that came to mind for me. <3

Unfortunately, I've watched more kdramas than cdramas, which I see from your completed list you prefer. Also, I don't see a lot of family and best friend betrayal, because I tend not to go for gritty stuff and I'm somewhat melodrama-averse. But if you're interested in taking a look at mostly kdrama romances that have some melodrama, here's what I've got:

Blossoms in Adversity shows some family dysfunction in the wake of that family's ruin, but female lead Hua Zhi isn't betrayed by them. And the drama isn't a story of her recovering from abuse like what Cheng Shaoshang suffered in Love Like the Galaxy. In contrast, Hua Zhi had an unusually empowering childhood, so she's got equanimity, capability and creativity right out of the box. What does relate to your request is the way  several episodes are devoted to her being hampered by the family hierarchy and powerless to stop older female members of the family from pulling them all deeper down. Also, she's a determined woman who works tirelessly despite obstacles - and achieves success.

However, when I read your original request, I wonder if you are searching more for a contemporary drama that lands harder on the side of realistic psychology? If so, Should We Kiss First? has wise messages about trauma. Rather than betrayal, it was a life event that so deeply harmed female lead Ahn Soon Jin, but her ex-husband's wife is a detriment, and her ex-husband divorcing her could be considered to be a betrayal - he certainly seems to be carrying some guilt. Also, her situation at work is backstabby in early episodes. Her healing arc is unexpected and deep, and she's in a very different place at the end of the drama. She's not a young woman coming into her own, but her story is powerful and moving. This is a really well written drama.

Personal Taste describes one young woman moving on from living a reduced existence due to childhood trauma towards finding her confidence and agency as a woman and as a designer. Again, due to my somewhat tame drama tastes, there isn't a betrayal in her origin story, unless it's that her father (in my view) is too absent and has failed to help her. This is a good drama, and goes beyond the ML-pretending-to-be-gay-roommate plot to actually have some emotional substance.

I have one more kdrama I'll share because it checks a lot of emotional boxes related to female survival and transformation in the face of harmful family, and that's Something in the Rain. Yun Jin A's mother is destructive, not only due to her trad expectations, but also because she's extremely emotionally unregulated. She's the kind of person that prospective families can see coming and want to avoid. Hence Yun Jin A's abject failure - in her mother's eyes - to tie the knot. Jin A does meet your condition of not taking revenge, and she does transcend abusive situations (she suffers workplace harassment as well as emotional abuse from her mom). But her story is not a simple one of working her way into a successful life. Rather, she succeeds at facing all the abusive situations and engaging with them in a way that allows her to survive with her soul in one piece.

So, Something in the Rain is controversial in English language forums, because viewers go into it expecting a happy ending noona romance, but it's actually a melodrama about one woman's journey into freedom. Also, it shows the impact on the leads of family and social and workplace abuse, and that's all realistic enough that the leads don't make perfect choices. And I as a viewer feel the cost of their freedom. To me, they're successful as human beings, but in terms of winning the materialism game, well, that's not what this drama is about. But for you, when I read the phrase "life of her choice," this is the drama I most strongly recommend. Because Jin A makes several choices that go against family and societal expectations, and she makes her choices from a place of grounded awareness. It's really affirming to witness that.

I hope you find something of interest here.

Seems like I can't explain the betrayal without giving spoiler.

Flourished Peony Disliked by her husband and her in-laws who only wanted her dowry, and even attempted to kill her; FL runaway and went to her house only to find out her father and step-mother planned to sent her back if they found her going home. So she went to another city to start-over and found success through peony business. You may also want to continue with the sequel (In the Name of Blossom) where FL found love.

Footprints of Change In first arc, FL's older brother tried to marry her for money to pay debt, falsified their father's will to get all inheritance asset. And their mother did everything to prevent FL from suing this brother for inheritance. And this brother also trying to marry her daughter to a dying kid for money (similar to ghost marriage). ML's adopted brother betrayed their country and his crime partner tried to kill ML. ML's adopted father left him because ML protected F after FL decided to save the mother (ML's adopted mother) instead of the baby. But it's actually ML's adopted brother that caused this. Then FL built an ob-gyn hospital and ML kept doing his work and stay to protect the city and the citizens before both finally went abroad post war.

My Cherie Amour They actually succesful from the beginning, it's just FL had a reputation of a party girl and some people thought ML may killed his late wife or at least making her suicide from unhappiness. 

FL had 4 brothers; the three tried to matchmake her to their convenient. One tried to match her with the brother of his secret girlfriend (who can't marry him before her two older siblings marry first), one tried to match her with his bank investor, and one tried to match her with his boyfriend (he's gay). The other one tried to match her with ML. ML's late wife killed herself because of ML's mother who felt like the world owed her. She only pampered one of her three children. ML tried his best to support the family, but ML's mother never felt he's good enough and ML's younger brother is a douchebag who love FL but find comfort in the hug of the half-sister of ML's younger sister's late husband. Yet he presumptously accused ML of many things, while actually it's him that seize ML's future bride (at least that's what both families assumed) and he's the one live recklessly. Like mother, like son. They moved on and changed, forgot and forgave everyone, and found love in each others, but not before so many things happened.