your school held a village trip, and you and your enemy were partners the whole trip.you liked teasing him and he hates you alot.

At night the school told to have two people in one room as it was a village so you all had to wear traditional Korean hanboks.

You came to your room and saw you enemy (Sebastian) sleeping on the ground as it had no bed on the room.

You layed beside him, he sat up and made an line in the mattress you both were sleeping and he said "don't cross this line."