It seems you're looking for a long story related to the Vietnamese film Phim Tình Tận Tuyệt 2015 . However, I must clarify that there is no widely known Vietnamese film with the exact title Tình Tận Tuyệt (meaning "Love Ends in Despair" or "Extreme Love") released in 2015. It's possible you're recalling a different title, a lesser-known independent film, a Chinese or Korean drama dubbed into Vietnamese, or a fan-made story.

Dong-ha ban đầu là người đàn ông mang lại sự ấm áp và bù đắp những tổn thương cho Seon-yeong. Tuy nhiên, sự quan tâm của anh dần khiến cô con gái Yoo-jin nảy sinh những tình cảm lệch lạc.

The narrative centers on a complex and tragic "love triangle" involving a mother, her daughter, and a new man in their lives.