Flash Marriage Episode 6

Warong refuses to accept that he got along so well with his new son-in-law; the night before, at Karaoke, Warong continues his vendetta against him. He offers his other two sons-in-law his shares of the company to whichever one of them gets rid of Pokpong for good. Nat, Tul, Pokpong and Lalin are finally told about Warong's past with Manun. They offer to help their father navigate the situation, but Nat plans to use this to take down Lalin for good. It's Lalin's birthday, and Pokpong takes her out for the day while her father plans a celebration for her at home. (Source: Dee at MyDramaList)