On Sept. 14, the Ministry of National DefenseŌĆÖs YouTube channel released a promotional video produced with SPAO. The video introduces a new challenge, ŌĆ£Send your regards to warm the hearts,ŌĆØ on the occasion of the 72nd anniversary of the Armed Forces Day, where if more than 1001 people participate in the challenge, then clothing brand SPAO will donate clothes to soldiers. In the video, Yook Sung Jae not only appeared as a soldier, but also participated in the narration, drawing keen attention. Meanwhile, Yook Sung Jae worked as both an idol and an actor, showing one impressive filmography that includes Goblin, Who Are You: School 2015, and Mystic Pop-Up Bar. He also starred in the entertainment show Master in the House. Then on May 11, he became the 4th member of BTOB to join the army.

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