MANILA, Philippines — Korean singer Kim Seok-jin, better known as Jin of the boy band BTS, expressed his admiration for Filipino-American singer Bruno Mars and hopes to collaborate with him one day.

ROSÉ and Bruno Mars’ “APT.” joins the lofty company of BTS’ “Dynamite” as the only songs by acts prominent in K-pop (Korean pop) to have reached the top five on Billboard’s Pop Airplay chart. “APT.” ...