Definitely ashes of love
the dude who is obbsesed with her is the second lead, the main leads brother when they first met, he liked her immediately but when he found out that she is the daughter of the water immortal, he manipulated her into marrying him by taking advantage of the fact that she has been shelved for her entire life and dose’nt understand What he means when he says “I love you” while she only thinks of them as friends he even manipulated her into killing the main lead so that the main lead dose’nt get in the way of their love even though he married her to get the water immortals support, he was still madly in love with her. in episode 58 or 59, she finds out all about his tricks and how he manipulated her she tells him to call off the wedding and he says all these obsessive things trying to stop her . soon when she says she is going back home, he locks her up until the marriage
this one has only an onbsesive second lead ????? but the main lead is pretty possessive as well so it’s a win win
a very very long description
the obsesed ones name : run Yu *night immortal*