In "Rude Miss Young Ae" Young Ae's mother witnessed Seung Joon's drunkenness.
On the 16th episode of tvN Monday/Tuesday drama "Rude Miss Young Ae Season 14" broadcast on September 29th, Lee Young Ae (played by Kim Hyun Sook) was fought over by Kim San Ho and Lee Seung Joon as they were in a lover triangle to get her heart.
Young Ae was frustrated on this day and went to the nightclub with Ra Mi Ran. She got overwhelmingly drunk and went out of control. At this same time, Seung Joon was also drinking with Doo Shi. As Doo Shik too was frustrated with feelings over his love, Hyun Young, he was received advice from Seung Joon who was also heartbroken.
After getting completely drunk, Seung Joon went over to Young Ae's apartment. There, he ran into Young Ae's mother. While drunk, Seung Joon asked Young Ae's mom, "Do you really like Kim San Ho that much?" and started to pour his heart out.
After showing his completely drunken side at the first instance of seeing them, it'll be interesting to see how the relationship between Seung Joon and Young Ae's mother will develop.