NCT's Haechan showed his excitement for Bruno Mars's recent Seoul concert in a hilarious way.

On June 17 KST, Bruno Mars performed the first of his two concerts at Seoul's Jamsil Olympic Main Stadium, which drew in a number of popular K-pop idols including members of NCT, WayV, EXO, SHINee, GOT7, The Boyz, Seventeen, TXT, and Pentagon.

Following the event, NCT member Haechan took to his DearU Bubble account to share photos commemorating the event using an 'etiquette shot,' a popular K-pop fan trend of holding up an idol's photocard or a concert ticket in front of food or drinks at the restaurant or cafe they visited either before or after attending that idol's event.

In this case, Haechan, who fans know is a big Bruno Mars fan, playfully pretends the pop singer is his own K-pop bias by holding up the concert's poster as well as his ticket for the show while seated at a hot pot restaurant. "These are etiquette shots, right," he jokes in a message sent to fans.

The photos as well as a screenshot of Haechan's playful question spread through Korean online communities, with one poster sharing the images with the caption "NCT's Haechan who watched the Bruno Mars concert and took proof photos at his hot pot after-party... including 'etiquette shots.'" In response, fans commented on Haechan's fanboy moment, saying, "Haechan is really so sincere when it comes to music," "He had a really good seat too, I'm so jealous," and "He's a real [K-pop fan trend] learner."

Check out the photos below!