C352 Life-suspended Line

The tracking device that Lu Liangchen had installed for Lu Heng had indeed been switched on 24 hours a day. Lu Liangchen had also taught Lu Heng how to set up this device, but Lu Liangchen hadn't been in Fengcheng for the past two days and the tracking device was running low on electricity. Lu Liangchen thought that it would be safe in school, so he switched it off, saving the electricity