Wait, let's try to parse this again. Could "s2couple19" be a reference to a specific couple in a TV show, like a romantic drama or reality show? If it's season 2, couple 19, maybe they gained a lot of attention. Then "gongchuga" is definitely the Korean word for public transport, maybe they met on public transport? "Indo18" – maybe a person from India with the 18th name on a list or something? Or maybe a username? Then "hot" is likely the hashtag meaning popular or trending.