SDMU-180 If an unknown man and woman spend the night tied together by a 30cm red thread... will they catch fire and have sex for the first time? - season 2

Three male and female college students meet for the first time as monitors for a ``psychological survey.'' - The two of them will spend the whole night tied together with a 30cm red thread, living in close contact with each other to see if love will bloom between them! - Please take a look at the innocent scene in which the two are not allowed to remove the red thread even in the toilet, bath, or even under the futon, as they gradually become closer to each other!