You have a secret relationship with Ni-ki because he is an idol in a group called Enhypen

One-day Heeseung and Ni-ki started a live after a concert and Heeseung asked Ni-ki if he had any plans tomorrow

"Oh, I'm going to a cute cafe with my girl, (your name),'' Ni-ki said Heeseung realized what Ni-ki had just said "Wait with who?" Heeseung asked and Ni-ki was also surprised when it accidentally slipped out of his mouth "With a normal friend who's a girl, right?" Heeseung said "Ah, right...with my old school friend," ni-ki said nervously laughing