The probability of Jei also being aware of Seokjin's feeling but acting dumb (and even getting goddarn engaged) as petty act of him never taking the initiative is also high ah. Even if he doesn't explicitly think so, sometimes humans are petty without them knowing for things they take for granted. He takes for granted Seokjin will always be by his side, even if only a friend, and Seokjin as well, is doing his best to keep the friendship at the cost of heartbreak.
Anyway, Han Jei deserves no sympathy for leading on a lady.
The probability of Jei also being aware of Seokjin's feeling but acting dumb (and even getting goddarn engaged) as petty act of him never taking the initiative is also high ah.
Even if he doesn't explicitly think so, sometimes humans are petty without them knowing for things they take for granted. He takes for granted Seokjin will always be by his side, even if only a friend, and Seokjin as well, is doing his best to keep the friendship at the cost of heartbreak.
Anyway, Han Jei deserves no sympathy for leading on a lady.