Sister, Love Me! I'm So Sweet!

[Older woman/younger man + only ever loved each other + sweet romance] What’s it like to have a younger boyfriend who turns into a cuddly puppy just for you? The puppy whines, “Sis, don’t leave me!” His girlfriend looks at him with disdain. “You’re so childish!” The puppy says, “Sis, give me time! I’ll grow into a real man who can protect you!” But behind her back, the cuddly puppy turns into a ruthless wolf, and keeps letting his true colors show. Gan Tang, a wolfish personal trainer, rescues a foxy woman from a knife-wielding criminal. She’s so cold and unattainable that he can’t help wanting to make her cry… Well… he wouldn’t mind making her cry during a workout, either… Gan Tang never imagined this woman would be so dangerous! Falling for her nearly costs him half his life. Who’ll make whom cry? That’s anyone’s guess…