Need a season 2, but a prequel on Chung-ah's life after her father take him abroad for school, for sure Yi-chan followed him as we saw that he graduated abroad. 6 ep will be enough hehe
First ep… how did the umbrellas end up on a deserted island?
To be fair korea is near the western pacific garbage patch, good chance some of its trash drifts away with the oyashio current and pushes it to japan to korea. (NVM ITS ALL PLOT CONVENIENCE.)
If the director could untangle and then resolve the plot twist about the leads' relationship, it would be a miracle.
the screenwriter is the one who wrote "kill me, heal me", "moon embracing the sun", and "chicago typewriter". would not be surprise if it will come out good.
K-Drama 
Not mentioning the introduction of "Zero (Yikyung Daughter)" AKA: THE LIVING PLOT ARMOR JUST DO IT !! SHES TOO OP LMAO
In summary, this arc revolves on the introduction of the variants and presumably an overarching story with the "shotgun buy" and "sweethome" universe.
SEASON 3 WILL BE FIRE WITH ALL THAT VARIANTS ! FIGHT SCENE GONNA BE LIT