In fact, it'd be rather amusing if Heewon get into a rather heated rivalry with disguised Yeseul, while at the same time try to 'befriend' Yeseul when at college.
I Love everyone's reactions so bad, Yuseung's worry, Heewon anger but caring about Yeseul, and Yeseul's panic attack bravery, also sunbae's gentleness. Everyone is precious, and i do not think that was possible. CUTE
the nail polish thing isn't real. there was a company saying they were gonna make it but they abandoned it and made some other test. undercover colors is the name if you're curious.