Subway line 2 in Xi'an, China, doesn't normally look like this.
On the week of Oct. 24, though, the signs helped Wang Yin propose to his girlfriend, Zhang Tingting.
Wang proposed that week by leading Zhang onto the car, where about a dozen of their friends were already waiting.
"It's not easy to get onto this particular coach," he told BuzzFeed Life. "I called the subway company many times to confirm so that she wouldn't miss the right one."
To make sure Zhang boarded the right car without suspecting anything, Wang told her a friend on the train had something for them.