"Stupid!" he snatches the backpack from your hands and runs further down the corridor.

You are trying to catch up with him, but it’s hard to run in heels, even if they aren’t high. You say 'Yeonjun! return the backpack!', you lose sight of him. You look around, clenching your hands into fists when he suddenly grabs you by the waist and pushes you against the wall

“How many times have I told you not to carry that heavy backpack you have?”