Lieutenant Zhang Ri Shan/Dr Liang Wan/Li Cu

She grew on him, a bit like a fungus. But a big clue was the moment he found he couldn't delete her number from his phone.

LC never had a thing for LW. It's been more annoying big sister vs annoying little brother to my mind. Halfway through and he seems to have more interest in the girl back in his class than anyone else. Even that seems a lukewarm affection. He's got mysteries to solve and bad guys to fight. Girlfriends can't quite compete with that yet in a teenage boys heart.