Why are you so big?

Childhood companions Han Jeong-woo and Choi Yi-seo have shared a friendship for 25 years. Jeong-woo has harbored feelings for Yi-seo for quite some time, yet Yi-seo does not regard Jeong-woo as a viable romantic option. One day, due to an unforeseen incident, the pair starts living together... "You, why are you so big?" "I told you, you're way larger than those toys." Are they treading into territory that friends should avoid?! "Put it in, put it in? I don't think it'll fit." "Our Yi-seo, it'll get all wet and fit in."