The tittle above is taken from the character setup from a variety show in Korea namely Running Man
Tiger refer to KJK or Kim Jong Kok aka Sparta kok.
The little betrayer refer to the shortest guy in Running man named HaHa.
The Monday couple refer to the member of lee ssang known as Gary.
And this 3 guys recently made a collaboration on a song called "Words I Want To Say To You" it is in korean but it is so addictive. and here is the song if you want to hear it.
what surprise me is that the tiger voice is so nice and soft despite having a though and terminator like image on the variety show. I guess that is why he is still so popular with all his muscle that show much manly side his voice on the other hand show the soft side of him and that is a very rare combination.