Also referred to as System 521, this is Shen Rong's Romance System — a mechanical voice residing in his mind. It chose Shen Rong as its host and transported him to the year 1348 in a parallel world with the mission to fall in love with the future founding emperor. It provides love navigation, key plot points, and can enter sleep mode after the host connects with the male lead. It can be woken by shouting a specific password three times.
