How to hate my EX

Original: ทํายังไง ให้ใจเกลียดเธอ

When Key(Meen) and Namkhing(Amee) two people who once loved deeply but talked less are forced to reunite on a trip they never planned to take together again. Between memories they can't forget and feelings they can't hate... When "I miss you" was never said, and "I'm sorry" never came. Are they still in love or just not over the pain?