For those who don't know, Hani's birthday fell on May 1, which is almost over in South Korea. It looks like many fans wished the idol a very happy birthday and as an answer, Hani uploaded cute selfies of herself and wrote the messages, "heh. I'm the happiest person in the world today :) Thanks to all you precious people," and, "Thank you. Mwah."
Happy birthday, Hani!