It's a big deal to be able to see ghosts and other ghost-like spirits. Like his father before him, Prince Lee Rin (Jung Il Woo) finds out that he can see ghosts and other supernatural things. Lee Rin becomes the leader of a group of night watchmen who patrol the streets from dusk until dawn to keep evil spirits away from the people of the Chosun Dynasty. Moo Seok (Jung Yun Ho), the prince's trusted bodyguard, is the best swordsman in the country. But their loyalty will be put to the test when they both fall in love with Do Ha (Go Sung Hee), who is the leader of the Ma Go tribe and needs their help to protect the spirits of the Baek Do mountain. But Park Soo Ryun, who is played by Seo Ye Ji and is the daughter of a court officer, will do anything to get married to Prince Lee Rin. The book "The Night Watchman," which is also called "Diary of a Night Watchman,"