Taeil may look clueless but he knows everything. He knows how Taeyong would sneak out from their house. He knows about those unregistered numbers on Taeyong's phone. He secretly follows Taeyong everytime he goes out without permission. Heck, even if Taeyong drunk himself to death in a bar Taeil was always a few meters away, watching him. He would take Taeyong home if he already drink too much. This is all he will do for Taeyong. He fell in love at first glance. Taeyong is his soon-to-be-husband. He will do everything for him eventhough it is clear that Taeyong doesn't like him. He believes that someday, Taeyong will return back his feelings towards him.