" Look in on" means just keep an eye out for somebody, or a little bit take care of somebody.

“Look in on”的意思是只是留意某个人，或者稍微照顾一下某个人。

I told my kidney, " Go, do a good job and take care of somebody." And I shed some tears.

我对我的肾脏说：“去吧，做好工作，照顾好别人。”我流下了一些眼泪。