There is a girl whose name needs to ne known.

She has straight hair.

in an earlier chapter she pairs up with Kang Han-Gyul in the 3-legged race

in chapter 39 when the inspector leaves the room and the guys are hiding in the girls beds she says "whew, thank goodness"

in chapter 40 she backs ito Kang Han-Gyul in a dark room, who catches her

She has appeared before that but is not focused on as being a romantic prospect.