Quick Travel Back to School

Heroine: Dual business online + try not to talk nonsense if you can do it Male protagonist: dual business online + full marks for expressive ability On her thirtieth birthday, Jiang An accidentally traveled back in time to when she was a freshman in high school, and participated in a math competition with top student Song Hao to make up for her youthful regrets. After traveling several times, Jiang An communicated with himself in another world in the form of letters, healing each other's worlds.