Yi Dong is Motan's best friend, bar none. Although the latter loves to mess with his buddy A, creating far more trouble for him than solving it, no one would ever question the friendship between the two. In fact, if they weren't both normally oriented males, all the romantic subplot in this story could probably be cut out.
Fortunately, they are both men and both are heterosexual.
Yi Dong understands every personality of Motan, even...yes, he even vaguely sensed a side that drifted outside the three regular mental states of his friend. But they were too young at that time, and when they met again, Motan only displayed three kinds.
As Motan's best friend, he always does his utmost to provide help, and even though they hardly exchanged money due to the latter's insistence, everyone would agree the two were practically joined at the hip growing up.
Of course, that's nonsense, since Yi Dong is taller than Motan; they couldn't possibly wear the same pants.
