Because the train from Z City to Harbin takes 23 hours and 47 minutes, Gu Yu bought a sleeper ticket. With one hand holding the ticket and the other carrying a backpack, he waited for Tang Yuran to enter the carriage before he followed to have his own ticket checked and boarded the train.
It's just...
Gu Yu glanced at the position on his ticket and then back up at the compartment in front.
It seemed that Tang Yuran had just entered that very compartment, and the berth number printed on his own ticket appeared to be inside there as well.
...
Gu Yu stood somewhat speechlessly in the corridor of the carriage, unsure of what to do for the moment.
He had simply bought a random soft sleeper ticket, and now he ended up in the same compartment as Tang Yuran?
If he walked over, wouldn't Tang Yuran recognize him at a glance??