I can help understand, What’s happening is our MC is constantly turning back time to prevent the FMC from destroying the world and to do that he is trying to do what ever action he can do to make her happy at least that is what I think
in case u don't know, the number before the year "2019" is the chance to fix.
MC was constantly trying to find something wrong to fix, yet he couldn't. The number decreases from 17 -> 1. There should be something breakthrough happen in the next chapter.