Master, Your Disciple Secretly Likes You

[When They Were Ten, On the Street]

Demon Lord: "Young friend, wait. You look just like someone I once knew."

Su Wan: "Huh? Who do I look like?" She studied his features closely. He looked only a little less handsome than she was.

Demon Lord: "My late wife."

Su Wan: "Huh?!" Startled, she spun around and hurried off.

Demon Lord: "No need to panic, young friend. I won’t force you into anything. I only want to take you as my disciple and teach you demonic cultivation. Would you be willing?"

"Demonic cultivation?" Su Wan glanced back at him, then walked even faster.

[After Reaching Adulthood]

Su Wanwan came to her master, cheeks flushed, and said:

"Master, I’ve mastered the technique."

"Mm." Her master, the Demon Lord, took little notice.

Su Wanwan stammered, "Master, I, I... Your disciple secretly likes you~"

"..." The Demon Lord asked, "Why secretly?" He opened his eyes and looked at Su Wanwan. "A disciple loving her master is just like a child loving a parent. It’s only natural. Master likes Wanwan too. Go and continue your cultivation."

"I..." That’s not the kind of love I meant...

Su Wanwan felt embarrassed, but could only bow demurely and obediently leave.

P.S. One-on-one, no substitute love interest. The male lead initially only wants to cultivate divine abilities, and throughout the story, he only loves one person, regardless of gender.