[SPOILERS AHEAD] With news of a sudden murder happening inside a hotel, cleaning lady Park Ji Yoon, keyboard player Kim Ji Hoon, A Pink's Eunji the bartender, Hong Jin Ho, and Jang Jin all set out to investigate the scene.

Jang Jin, also known as Jang-kuza (like Yakuza), went looking for his long lost sibling. A firearm which was used to kill the victim was discovered as Jang Jin explained the weapon had disappeared the night before the incident.

However, it was revealed that Eunji wasn't just any normal bartender, but a secret killer! She had numerous appliances in her room which could have been used at the crime scene.

Later, a master key and a drawer key was found inside cleaning lady Park's bag. Inside the drawer was a note stating specific instructions to sound the fire alarm at a certain time. Maid Park claimed she had found the item while cleaning the room. The members also began looking underneath the mattress and found a suspicious bunny doll in her room.

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Jang-kuza found out that the victim had killed his real sibling and disguised himself as the sibling. All in all, Park Ji Yoon received a surprising 5 points as the most suspicious. 

In the end, the members had failed to solve the intricate case, revealing Jang Jin had been the culprit all along.