I'm not sure which specific 'bts first love story' you are referring to. Each member of BTS may have their own experiences or ideas about first love that they've shared in various interviews or lyrics. For example, some of their songs might allude to the feelings of first love.
Well, in BTS's music and their individual statements, we can get some glimpses of their views on first love. RM has often talked about his growth and how his past experiences, perhaps including first love, have influenced his songwriting. Their lyrics are filled with emotions that could be related to first love, like the innocence and excitement that come with it.
The 'bts first love story' could be a complex tapestry of different elements. Their early days as trainees and then debuting in the highly competitive K - pop industry might have affected their perception of first love. They might have had to sacrifice some of the normal experiences of first love due to their busy schedules. However, their music serves as a medium to convey those unspoken feelings. For instance, in some of their ballads, the lyrics seem to touch on themes of longing and reminiscing about a first love, whether it was a real person or more of an idealized concept.