Until We Meet Again the series & intro to BL dramas

I started watching Asian Dramas ( mostly the kdramas initially ) sometime last year. It was one or two shows from Netflix initially but then I had a lot of free time in the last two months of 2019, and I finished watching about 15+ Asian dramas before the year ended.

Based on my watchlist on MyDramaList ( MDL) recommended me the series Until We Meet Again the series (UWMAseries) which had just started airing [the last episode will be released on Feb 29th]

The mention of the red thread of...