a hidden challenge, <Detective Yoo Man>

[리게뷰]

Among the remaining a hidden challenge, <Detective Yoo Man>
Tell me how to clear it plz.... mm

[Bairman]

Click all the items throughout the game that are marked with exclamation points, like those in Yuman's room at the beginning (also the attic and living room). They're also found at the office and in each of the girl's rooms.

[리게뷰]

Originally posted by Bairman:

Click all the items throughout the game that are marked with exclamation points, like those in Yuman's room at the beginning (also the attic and living room). They're also found at the office and in each of the girl's rooms.

Finding the necktie, exploring Milk Corporation, Follow Mal-sook, The Attic Girl, Gran, Eun-bi, Min-jung
I can't do all of these, is there anything missing?