Ong Seong Wu has shown his passion and a great attitude towards acting and the staff noticed it. He was completely in character for Choi Jun Woo. One of the most unforgettable lines is "There's no such thing as an already ruined life,' from episode five is especially memorable". The viewers watched this scene when Jun Woo felt sadness mixed with anger. The viewers felt his genuine emotions and sympathized with him.

Ong Seong Wu said, "Please look forward to Jun Woo's growth and his chemistry with his classmates, including Soo Bin. The drama is already at its midway point. I worried a lot, but I was able to do it until now thanks to many people loving Jun Woo. Thank you so much. Please take good care of your health in this hot summer and please look forward to 'Moments of 18' and Jun Woo with lots of love and interest."

For Kim Hyang Gi, the most unforgettable line was Jun Woo's narration at the beginning of the drama. Her favorite line was "I'm going. I'm drifting somewhere again like this. Even if I've never waited for them, the times and moments that came to me unannounced. Anyway, this moment. Anyway, eighteen." She said that it was about the anticipation of a new meeting to happen. It was a scene where the son argued with his mother. She said that this was relatable to students and parents relationship.

Kim Hyang Gi said, "Please look forward to how each of the character's conflicts will be solved and in what way. I also hope you'll watch how the characters' relationships change through this. Please continue to tune in to 'Moments of 18,' which will get even more fun."

Shin Seung Ho chose the running scene of Hwi Young from the 8th episode. He explained the scene where his parents gave so much pressure on Sang Hoon's dad and Sang Hoon's dad got on his knees. He saw everything and gathered all his strength to run. He got tired and fell from running.

Shin Seung Ho said he felt bad for his character who felt resentful towards his parents and hated his life. Shin Seung Ho, "His relationship and conflict with his friends and his conflict with his parents can be seen in depth. Please look forward to the changes Hwi Young will face through that conflict. I hope your exhausted mind and body will recover and feel healed through 'Moments of 18' even if it's for a second in this hot weather. Please watch the remainder of the story and give lots of love."

Kang Ki said that Soo Bin found Jun Woo's name again in the first episode. His favorite line was "Farewell transfer student. Have a good life with no presence". This encouraged Jun Woo to continue fighting in life. The drama would have ended already in the 1st episode if Soo Bin did not stop him and if Jun Woo had run away. He explained that this second half the new skins forming in the scars of children and adults will play out. The characters will give so many emotions that viewers will feel too.