On the April 22 episode of 'Laws of the Jungle,' everyone got busy preparing for 2PM Chansung's birthday! 

The 'Laws of the Jungle' family collected all sorts of ingredients such as sea food, chicken, and papayas to cook a hearty birthday meal made specially for Chansung.

Seolhyun said, "I've never cooked before but I'll try to make a pineapple three-tier cake [for Chansung]," and succeeded in baking a cake that may not have been perfect but was full of heart all the same. 

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Then Seolhyun sang a birthday song for Chansung, and a surprised Chansung said, "How did you know? I was very touched but I don't know how to express my feelings."