Be My Favorite

Though Fish Upon The Sky is not about time travel, the protagonist of Be My Favorite, in pursuit of his crush, ends up with the person he thought to be his love rival.

Both are Thai BLs that involve first one and then both of the MLs time traveling into the past and changing events in their lives. At some point in both dramas, one of the MLs is hospitalized and the other ML travels to the past to try to convince him not to meet/become involved with him, in the hopes of saving his life.

The main character, who is initially in love with someone else, after a sudden downfall/demise, gets to go back in the time with a chance of altering and mending things while falling for someone completely different in both the series.

The concept of time travel. In be my favourite kawi travels from future to past to fix the past with crystal ball being the medium. In case of the warp effect Alex trvales to the future from past to fix the past with a camera being the medium. Both being fixing the past for a better future. The story and events are interesting and intruiging.