Henlixes

Felix and Hyunjin were teachers.
Felix and Hyunjin's classes won the district sports games, and so they were sent to the national games in Beijing (they lived in Seoul)
a long journey and finally both classes with their leaders checked into the hotel. The kids lived in a room in twos or threes - boys with boys, girls with girls, and the teachers (Hyunjin and Felix) alone.
Felix and Hyunjin were just friends and colleagues, but they felt something more, although they didn't talk about it.
After checking into the hotel, Felix was unpacking his things in the room when suddenly Hyunjin came up from behind.

Hyunjin approached Felix in the hotel room when he was laying out his things