Restart the College Life of Signing In

Jiang Yunhan, an ordinary post-90s generation and an ordinary migrant worker, was unexpectedly reborn at the beginning of 2021 and returned to September 1, 2012, the day when he entered the university gate, and the era that was strange and familiar to him. Let's see how he relied on the "sign-in system" to restart his university life, change himself, change the past, and have no regrets about his youth and life! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.