My Yandere Merman Senior Won't Leave Me Alone

“Suishui, you saved me, so you're responsible for me to the end.” Ten years ago, I casually scooped up a fish that was on the verge of dying. Ten years later, that fish became my senior at school. His name was Wen Shi'an. He is the ruler of the deep sea, an obsessive king, yet in front of me he pretends to be a cool, refined model student. He paved the way for me, while cutting off every path of retreat. Until one stormy night, he trapped me in his arms. Cold scales brushed my neck as he murmured hoarsely: “Don't let me catch you running again... my little lifesaver.” He helped me take down the scum and stood up for me. He even taught me to swim, guiding me with his own hands. Everyone says I'm incredibly lucky. Only I know that this cool, aloof senior looks at me as if he might swallow me whole. I pretended to be obedient while secretly investigating, only to discover that my memories of being eight years old were completely blank. And beneath his sleeves, an inhuman shimmer of scales glinted faintly... [Reading note: A charming little white flower who lures them in vs. an unhinged mermaid king. She flees, he pursues, and she has no chance of escape!]