In Hotel King, episode 17, Ah Mo Ne(played by Lee Da Hae) found out about Cha Jae Wan(played by Lee Dong Wook)’s birth secret.
Lee Joong Goo(played by Lee Duk Hwa) threatened Mo Ne that he will disclose all of Jae Wan’s crimes, and Mo Ne had to visit him at the police station.
Joong Goo showed Mo Ne the result of a gene test of him and Jae Wan. Mo Ne was shocked and said, “Cha Jae Wan must have wanted to kill himself knowing that you’re his father…” She then said, “Good. Get lost, both of you.”
On the way out, Mo Ne cried and said to herself, “Cha Jae Wan is Lee Joong Goo’s son. So I should not forgive him. Ah Mo Ne, if you forgive him again this time, you’re not even daddy’s daughter. I’m going to kill you if you do.”