If you go south from Badin Square, the heart of Hanoi, there is another lake, which is Hoan Kiem Lake. Around Hoan Kiem Lake, a large commercial area is formed. It can be said that Dongdaemun Market in Seoul, Namdaemun Market, and Myeongdong are mixed. Traveler Street is also formed by a road around the lake. Hanoi's famous St. Joseph's Cathedral is also nearby. Hoan Kiem Lake is much smaller than West Lake, but it is a lake loved by Hanoi citizens. It feels like Seokchon Lake in Seoul. First of all, if you look at the name of this unfamiliar lake, Vietnamese also uses many words in Chinese, just as there is a Chinese character in Korea. 'Hoan' is a ring for returning Chinese characters, and 'KiM' is a sword when used in Chinese characters. In other words, the meaning of the name means the lake where the knife was returned. According to Vietnamese legend, before leaving the war, a general took a sword from a turtle in the lake and went to battle, took the great victory and returned the sword. In Hoan Kiem Lake, there is a small island between the lakes, and if you cross the bridge to the island, there is a full-length, and the main character of the story that returned this knife is enshrined.