Kibum lives in a world where red strings of love is kind of an everyday thing for him. He's what they call Guardian of Love and his job is to take care of these threads and untangle them whenever they get caught in things or bundled together. As far as he and all his ancestors know, they're unbreakable. So when they start finding severed red strings, worry stirrs among the Guardians and they frantically search for the cause. And by the way, who is that pink-haired guy Kibum a