You cannot force someone to be in a relationship with you and try to show your right by trying to be intimate forcefully. No one is ever comfortable facing sexual abuse in any type of relationship, be it lesbian, gay, or straight. If we think about Sai's character it is her right to refuse to be in a relationship with Rangrong. It is fine that Rangrong expressed her feelings toward Sai but she should not force, captivate, keep an eye on 24 hours or imprison Sai.
It would have been good if they showed a happy ending instead of a sad ending but we need to accept the reality. Would love to see the male lead acting in a show where he has a happy ending.
To be honest, some of the dramas of Cheng Yi in the past always showed a sad ending for his character, leaving aside Love and Redemption which had a happy ending. I think it's high time that Cheng Yi chooses a drama where his character has a happy ending.