Seo In Guk went on SNL to explain how to act like Yoon Jae from Reply 1997 and it's PERFECT.
1. Have Eyes Full of Emotion
No matter what you're looking at, you should express everything you're feeling with your eyes.
Find little ways to touch everyone. Make them fall in love with you.
3. Take Care of Her, But Be Detached
Don't let it show how much you love her, act cold towards her but make her safety and happiness your number one priority.
4. Be Wet
That's it. Just be wet and shirtless.