The manwha is a BL one and the MC gets tricked by marrying the ML's sister. The sister went on with it with the brother's plan because of revenge or debt
The plot is the eldest brother takes a mission to recover a certain researched drug by the mafia headed by his adoptive father but it was stolen by the ML's brother and the MC's brother got involve.. So the MC pretend's to be the ML's brother's friend to complete his mission.
The manwha is a BL one and the MC gets tricked by marrying the ML's sister. The sister went on with it with the brother's plan because of revenge or debt
sorry that is all i remember on that manwha
This
https://www.mangago.zone/read-manga/falling_down/
Ohhh thank you!!!