BoA showed off her tattoo.

On May 17, she posted on her Twitter "Kiss Me", along with a single photo.

In the photo is BoA with a pink off-the-shoulder top that reads "Kiss Me.”

BoA is showing off her upper backside with her hair held up high. This unexpected sexy look from her is catching a lot of attention.

Internet users who saw the photo commented, "Can I really do that?", "That's really attractive," and "That was so unexpected.”

Photo: BoA Twitter