Putting this together, maybe the write-up is about a couple that became popular online ("hot") because they met on public transportation ("gongchuga") and their story is linked to "Indo18" which could be a username or a person from India. The "s2couple19" might be a way to reference them in a specific context like a TV show or social media campaign.

“Ready for an adventure?” he asked, his voice low and a little husky from the salty breeze.