“No matter what, the sweet moment of taking an oath is worth recording, even if people break up years later. Hopefully, when the letter arrives seven years later the couple will receive it together.” Others were quick to see the potential downside of the idea.

“It’d be more than depressing if I received a love letter from seven years ago and I was no longer with my then-loved one,” observed Sun Lubin, a graduate from Beijing’s elite Tsinghua University.