the stars in the ceiling just remind me of them, the protagonist having an illness, both female protagonist have mommy issues and their illness is not taking seriously and/bc of their brother that the mom protects, their family in both cases dont know that the female lead is sick.

the time capsule, he having a secret crush since high school, him having an injure and not being able to swim again, meting each other after a long time, both losers, neighbours, both male leads missing swimming

similar bc of the intro and also bc of the spirit and monster kinda thing idk i think theyre similar bc of their supernatural aspects

their relationship is kinda similar bc in the present we see them struggle with their relationship and theyre not in sync they fight and we see flashbacks when their relationship was good so in both cases we wondered what went wrong in their relationship and throughout the series we see the reasons of why the relationship failed and we see how they reconcile again and that they always have loved each other its just that the circumstances prevented them from resolving their conflict and basically miscommunication between the two

in ep 15 when he says be my family it remind me of them bc the female protagonist in both of the dramas have a cozy and warm family but the protagonist dont so when they are together they are their own family and also they rely on eachother when they both are struggling

their relationship is similar, both of the couples have an unconditional love for each other and always support each other, they both are suffering in their own individuals ways but when they are together even if its just a minute it will all be okay

their relationship remind me of the protagonists bc they both fight like boxers and then became a strong friendship and i think that will be the case here bc at first they will be rivals then he will teach him how to fight and soon they become best friends ho help each other out at least from what i see in ep 1

its similar one bc of the music its the same that when they announce the votes in night has come, its also similar in terms of the competition and survival except that in pyramid game they dont die