taesan is just playing around in order to irritate him.
from what i’ve understood, their dorm are in the same building but different floors, so when they are together in the elevator taesan likes to cancel the call for jaehyun’s floor in order to make him ‘lose time’ and let him stay longer.
he is just ‘teasing him’ + every time he leaves he says ‘see you tomorrow’ with the biggest smile on his face acting innocent.
they already talked about this twice in the last month, so i wonder how often this happens 😭