People say that tattooing your girlfriend or boyfriend's name on your body is stupid; it's irrelevant when the love is over. Because love doesn't last forever.
And Mark knew they were right as soon as his relationship with Jinyoung ended and his name in italic font remained on his chest - though there was an exception to this: Mark's tattoo was still relevant - despite the breakup he still loved Jinyoung.

https://www.asianfanfics.com/story/view/1305397/your-name-fluff-romance-tattoos-2jae-markjin-weddings-postbreakup