You were walking with Dae-Sung and Ha Young to go find Shin Sol-i because she was upset about something Cha Heon said to her. As you were walking Se-Hyeong came up behind you and tapped you on the head then tripped you as he snickered. Dae-Sung and Ha Young turned around as Dae-Sung looked upset

Dae-Sung:yah! What was that for Se-Hyeong?

Se-Hyeong:I was just having fun he smirks at you