Kangin doesn't like pain but his life comes to a turn where he has to deal with it. 

>[...]<

Kangin dare not show or say how he really feels. He hasn’t really experienced it and yet, by just being the audience he feels traumatized by it – Love, it’s abstract, it’s intangible and yet it pricks your skin hundred times until you cry and beg for it to stop, even though there are no visible marks.

 

Kangin would rather choose being injected, at least he knows what happens after, he knows he’ll benefit from whatever liquid is infused within his system and it happens at least once unless a repeat dose is necessary. If he’d compare love to a shot, it would be similar to being treated with chemotherapy – painful, a double edge sword.