SDMU-180 If a stranger man and woman spend the night chained to a 30cm red string... Will they catch fire and fall into first-time sex? - season 2

Three pairs of male and female college students who met for the first time as monitors for the Psychology Survey. - While tied with a 30 cm red thread all night, we will have them live a thrilling close-knit life, and we will verify whether they will grow in love! - Watch the innocent appearance of the two people, who are not allowed to remove the red thread in the toilet, bath, or futon, gradually shortening the distance!