Deep down, Zhang Yichen actually understood that his mother always needed companionship, and this companionship needed to come not from others, but from his own family. He once personally saw his mother tell his child that she hoped her child could accompany her, but her son deeply refused. It was at that moment he knew all of the truth; he wasn't that cruel, nor that heartless. He simply chose a path he could never turn back from.
"Don't leave. Do you think Grandma is lonely and bored being here alone? Stay here with me for a while, keep me company and chat a bit. Grandma won't force you to do anything else. As long as you keep Grandma company for a little while here, I'll let you leave, okay?"