Go Jun Hee, who was filming a movie in Busan, was not expecting the surprise event in the least. Jinwoon said, "I can't do it for her on the day of her actual birthday, so I wanted to do it before. I consulted the movie staff and prepared a surprise birthday party." 

After their yacht date at the beach, Jinwoon told the actress that he would be returning to Seoul, but he showed up on the film set instead. He appeared as an extra, surprising Go Jun Hee with the birthday song and a cake. The 2AM member even went the extra mile by getting snacks for the staff. 

Go Jun Hee commented, "I experienced shaky legs for the first time. I thought I had heatstroke. I didn't even think of this kind of surprise. I was impressed."

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Happy Birthday, Go Jun Hee!