Season 1 of A Love to Kill premiered on July 26, 2017.

Puen grew up in a foster home with his elder brother, Mek. After a misunderstanding occurs between Mek and his girlfriend Inthira, an emotionally wounded Mek jumps from a rooftop and falls in to a coma. Driven by anger and thirst for revenge, Puen approaches Inthira as a bodyguard.

But as he spends time with her, Puen gets increasingly burdened by the forbidden love he develops. Meanwhile, Inthira - not knowing about her ex's relationship with Puen, nor his intentions to destroy her life - falls in love with him.