Bomi, Suk-Ho, Jiseon and Jae-Peel attended Optics and Photonics Congess 2019 held in Busan, Korea. Bomi and Suk-Ho gave oral presentation while Jiseon and Jae-Peel gave poster presentation. Suk-Ho also gave poster presentation and selected for the best poster award in display session. It was very interesting and attracted many interests from the audience. It was a great oppertunity for the students to broaden their knowledge and communicate with the researches who are in the similar fields.