White Valentine () is a 1999 Korean romantic film directed by Yang Yun-ho.
 It stars Park Shin-yang with Jun Ji-hyun in her movie debut.
Blue Sea Lake (in French: Lac Blue Sea) is a lake in the municipalities of Blue Sea and Messines, Quebec, Canada, about 90 km north of Gatineau.
 It is known for its crystal clear water and is surrounded by cottages on its shores.
Glaucus atlanticus (common names include the sea swallow, blue angel, blue glaucus, blue dragon, blue sea slug and blue ocean slug) is a species of small, blue sea slug, a pelagic aeolid nudibranch, a shell-less gastropod mollusk in the family Glaucidae.
Daisy () is a 2006 film directed by Hong Kong filmmaker Andrew Lau of the "Infernal Affairs" trilogy.
 "Daisy" is an urban romantic melodrama involving young painter Hye-young (Jun Ji-hyun), Interpol detective Jeong Woo (Lee Sung-jae), and professional hitman Park Yi (Jung Woo-sung).
Jun Ji-hyun (born Wang Ji-hyun on 30 October 1981), also known as Gianna Jun, is a South Korean actress.
 She rose to fame for her role as The Girl in the romantic comedy "My Sassy Girl" (2001), one of the highest-grossing Korean comedies of all time.
 Other notable films include "Il Mare" (2000), "Windstruck" (2004), "The Thieves" (2012), "The Berlin File" (2013) and "Assassination" (2015).
Lee Min-ho (, born June 22, 1987) is a South Korean actor and singer.
 He first gained widespread fame in Korea and parts of Asia with his role as Gu Jun-pyo in "Boys Over Flowers" in 2009.
 The role won him a Best New Actor award at the 45th Baeksang Arts Awards.
 He is noted for his leading roles in "City Hunter" (2011), "The Heirs" (2013) and "The Legend of the Blue Sea" (2016).
 The success of Lee's television dramas throughout Asia established him as a top Hallyu star.
 Lee starred in his first leading role in film with "Gangnam Blues" (2015), followed by his first China-produced film "Bounty Hunters" (2016).
Il Mare (; lit.
 "time-transcending love") is a 2000 South Korean film, starring Jun Ji-hyun and Lee Jung-jae, and directed by Lee Hyun-seung.
 The title, "Il Mare", means "The Sea" in Italian, and is the name of the seaside house which is the setting of the story.
 The two protagonists both live there two years apart in time, but are able to communicate through a mysterious mailbox.
Windstruck (; lit.
 "Let me introduce (you to) my girlfriend") is a 2004 South Korean romantic comedy.
 It stars Jun Ji-hyun, Jang Hyuk, and was directed by Kwak Jae-yong.
 The film held its premiere in Hong Kong, attended by Jang and Jun, on 28 May 2004, being the first Korean film to do so.
 It was released on June 3, 2004 by CJ Entertainment and ran at 123 minutes.
The Berlin File (; lit.
 "Berlin") is a 2013 South Korean spy action thriller film written and directed by Ryoo Seung-wan.
 Ha Jung-woo stars as a North Korean agent in Berlin who is betrayed and cut loose when a weapons deal is exposed.
 Together with his wife, a translator at the North Korean embassy in Berlin played by Jun Ji-hyun, they try to escape being purged, with Ryoo Seung-bum and Han Suk-kyu playing North and South Korean operatives on their trail.
The Legend of the Blue Sea () is a 2016-2017 South Korean television series starring Jun Ji-hyun and Lee Min-ho.
 Inspired by a classic Joseon legend from Korea's first collection of unofficial historical tales about a fisherman who captures and releases a mermaid, this drama tells the love story of a con-artist and a mermaid who travels across the ocean to find him.
 It aired on SBS every Wednesday and Thursday at 22:00 (KST) started from 16 November 2016 until 25 January 2017.

Question: What "Boys Over Flowers" actor co-starred in The Legend of the Blue Sea with Jun Ji-Hyun?
Answer: Lee Min-ho