During this episode, 'Idol Room' opened up its 3rd ever 'Havana Korea' contest - a contest to see who can put on the best freestyle cover performance of "Havana". Previously, the 1st 'Havana Korea' contest featured Red Velvet, and the 2nd featured Sunmi. Each of the Oh My Girl members tried their best to bring out their inner sexy sides for the 'Havana Contest', but whose sexy, confident moves earned applause from everyone in the end? 

Afterward, Oh My Girl set out to prove that they deserve the title of "Refreshing idols who could eat 100 lemons". The 'Idol Room' staff brought out a crate filled with exactly 100 lemons, and the members actually took on the challenge of trying to eat as many as they could!

Of the Oh My Girl members, Binnie came out on top as the best lemon-eater. Watch clips from this week's 'Idol Room' below!