[Unplayed Short Lines] Fantasy

INTRODUCTION:
Da-jeong, a shy man with a secret crush on White, the owner of a nearby flower shop, lives a quiet life. One day, as usual, he accidentally switches his phone with Hayan‘s and discovers a strange app. To his surprise, the app presents a main quest: to win over Hayan, the object of his unrequited love. As the app commands, Da-jeong begins to take action.

[Success reward: Unbreakable eternal happy ending]
[Failure: ????]
And what’s this about a forced shutdown due to a hidden keyword…?
“What is the hidden keyword? And what happens if I fail…?”