That one over his ribs is almost certainly just part of the Advice makeup which, by the way, was inconsistent as all hell 😂 It moved around so much (even within the MV) and then even more for the live stages. Who needs continuity these days?

Anyhoo, you can see in this frame that other than the eye/diamond scenario, there's nothing else there (the teeny tiny nip notwithstanding).

Below is from one of the live stages and you've got the same design with the eye/diamonds, just wrapped a bit further round. Alas, no real tattoo here 😕

Could you imagine Taemin with something similar to this tattoo of Ten's though?

It's always reminded me of Buffalo Bill from Silence of the Lambs who, if we're being honest, was pretty sexy in a kinda creepy serial-killer way. So aye, Taemin with a nice, bold titty tat would be grand.