'Reply 1994' Kim Sung Kyun was 18 years old.
On the 8th episode of cable TV tvN 'Reply 1994' broadcast on November 9th, Yun Jin (played by Do Hee) picked up a wallet on the street. Sam Chun Po (played by Kim Sung Gyun) who was about to go on a bike trip came back home after realizing he lost his wallet.
However, when Yun Jin opened up the wallet, the ID was not from 1976 but 1977. Sam Chun Po tried to get the wallet from her and Yun Jin said, "Say 'Give it to me' 'Sister, give it to me' with two hands. How are you so informal to an elder? How did you age this way?"
Following that Sam Chun Po tried to explain, "I was added to the family registry 2 years later" but Yun Jin said, "What was your family doing that they waited two years? This makes no sense. It's not even an earlier 1976 but 1977. When I was walking, you were an infant. If you're informal to me again, I'll pluck your tongue out so do as you wish.
As Sam Chun Po responded, Yun Jin said, "Go on ahead. It's like your sweet 16 backpacking trip and you can't sleep on the street so call me if you run out of money," she said like an older sister.
