The Dream/Reality Kiss happens in episode 10 of While You Were Sleeping. Hong Joo (Suzy) finds Jae Chan (Lee Jong Suk) on a rainy night after seeing him in her dream where he had been searching for her. She tells him of the dream and what happened between them. He wants to know what he said to her in the dream, and Hong Joo explains his thoughtful words.
A smile crosses his face, and he asks how she responded. Her eyes sparkle as the scene begins to cut between the dream and their real conversation. And in both, she pulls him in and tenderly kisses his lips.
They then slowly pull back and gaze into each others eyes. Jae Chan smiles again, cups her face in his hand, and kisses her again. A more passionate kiss follows as they remain in each others embrace. The scene continues to cut between the dream and the real kiss for one wonderful and magical moment.
This kiss was so many things. Not only was it very unique, it was packed with emotion and sweetness. The way it was filmed and edited was beautiful and perfect to make for a truly memorable and one of a kind kiss!
See the kiss here: https://youtu.be/fIoN7IKIO40
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Kdrama Kisses 
Aww! I loved this kiss too and had forgotten about this drama! Someday I will rewatch it!
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It really was such a wonderful kiss and drama too! I need to re-watch it someday also 🙂
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And the ost in the scene was top notch
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Completely agree! It was a perfect fit and just made an already amazing scene even better 🙂
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