Siheyuan: the Educated Youth Who Returned to the City in 1977

Qian Jin traveled back to Haibin City in 1977 from 2027 and became an educated youth who had just returned to the city and was waiting to report. The door lock of House 205 in Tongzi Building was rusty. The neighbor boy who was as thin as a bamboo pole ran downstairs, held up a glucose bottle and poured anti-rust oil into the keyhole - and it opened with a click. He pieced together memories from the original owner's diary. He couldn't even open the door to his own house. He had to learn how to be so sophisticated these days by changing the lock.