Manhwa who only eats with seniors and juniors on Christmas

(1)When you’re done with your part-time job,
(2)on Christmas Day
(3)Let’s eat for a bit
(4)I won’t eat it
(5)If it’s for
(6)what
(7)Whenever I eat,
(8)I’ll go home first

(1)Sorry, SANO
(2)by increasing one’s work to
(3)Over there
(4)older alumnus
(5)See you later
(6)I’ll go first