Happiness is very, very important, which is why Seulgi and Irene take it upon themselves as the "mothers" of their two little "chicks" to make sure that they take a vacation full of nothing but happiness and laughter. And so begins what Wendy and Joy dub as "Mother Hen And Bigger Mother Hen's Plan To Make Us Die From Embarrassment".  It won't be that bad, will it? 

We learn from our mistakes, all of us do. Sometimes it takes more than one mistake to teach us, though. In Irene's case, it takes her a little too long to figure it out, and the one she loves the most slips away from her.  All because of her mistakes.

Where Kyungsoo is in love with his young neighbour, Jongin; Where Jongin is in love with his adult neighbour, Kyungsoo; And Byun Baekhyun is out to annoy everyone.