Mark has actually never outright told the rest of the members that he has synesthesia. He's nervous, okay!? Whenever he opens his mouth the words just don't come out and soon another member is filling the silence with chatter. Sometimes Mark really hates being the quiet one.    (or, alternatively, the mark has synesthesia au no one asked for but i wrote anyway lol) [actually, that's a lie, i asked for it lol]

Everyone knows that Mark Lee is a hardworking person. He always does his tasks without complaining and give his best. That is why he is loved by s. 

When Mark Tuan moved to Korea with his father and little brother, he certainly did not expect to be the centre of everyone's attention, especially that of a pair of best friends', who were the exact opposite of each other.