In professional football, a transfer is the action taken whenever a player under contract moves between clubs.
 It refers to the transferring of a player's registration from one association football club to another.
 In general, the players can only be transferred during a transfer window and according to the rules set by a governing body.
 Usually some sort of compensation is paid for the player's rights, which is known as a transfer fee.
 When a player moves from one club to another, their old contract is terminated and they negotiate a new one with the club they are moving to, unlike in American, Canadian and Australian sports, where teams essentially trade existing player contracts.
 In some cases, however, transfers can function in a similar manner to player trades, as teams can offer another player on their squad as part of the compensation.
Li Shang (Chinese: 李尚; Pinyin: "Lǐ Shàng"; Hangul: 리상 , born 20 June 1991 in Hunchun, Yanbian Korean Autonomous Prefecture, Jilin) is a Chinese football player of Korean descent who currently plays for Changchun Yatai in the Chinese Super League.
John Hendy is a former professional American football player who played defensive back for two seasons for the San Diego Chargers* John H. Hendy American football player San Diego Chargers 1985 to 1987 Drafted by the San Diego Chargers in the 3rd round (69th overall) of the 1985 NFL Draft.
 Voted First Team NFL All-Rookie at cornerback 1985 was also named AFC Player of the Week 14 for his 2 interception game returning one 75 yards for a touchdown against Buffalo Bills.
 Also coached successfully at Wilcox High School as an assistant for 7 years helping earn the schools 2 CCS championships
Bai Yuefeng(, Korean: 백악봉 ; ; born May 25, 1987 in Yanbian, Jilin), also known as Bai Lei ( Korean: 백뢰 ) is a Chinese football player of Korean descent who currently plays for Tianjin Teda F.C. in the Chinese Super League.
Li Chunman (; Hangul: 이춘만 ; born 30 May 1962 in Yingkou) is a Chinese football manager and former football player of Korean descent.
 He is currently the assistant coach of Chinese Super League side Guizhou Renhe.
Sung Jun Huh (born 13 June 1992) is a former American football player who played for the Samsung Frankfurt Universe in the German Football League.
 He played at outside linebacker.
 He is possibly the only professional American football player, who is of Korean descent, besides Hines Ward.
Li Guang (Chinese: 李光; Pinyin: "Lǐ Guāng"; Hangul: 리광 , born 20 June 1991 in Hunchun, Yanbian Korean Autonomous Prefecture, Jilin) is a Chinese football player of Korean descent who currently plays for Changchun Yatai in the Chinese Super League.
Kazunari Okayama (岡山 一成 , Okayama Kazunari , born April 24, 1978) or Kang Il-Sung (Korean: 강일성, Hanja: 康一成) is a Japanese football player of Korean descent.
 He plays for Nara Club.
Hines Edward Ward Jr. (born March 8, 1976) is a former American football wide receiver, businessman, and television personality.
 He is a current CNN studio analyst who played 14 seasons for the Pittsburgh Steelers of the National Football League (NFL).
 He played college football at the University of Georgia.
 The Pittsburgh Steelers selected him in the third round of the 1998 NFL Draft, and he became the team's all-time leader in receptions, receiving yardage and touchdown receptions.
 Ward was voted MVP of Super Bowl XL, and upon retirement was one of only thirteen NFL players to have 1,000 or more career receptions.
In American football, blocking or interference (or running interference) involves legal movements in which one player obstructs another player's path with their body.
 The purpose of blocking is to prevent defensive players from tackling the ball carrier, or to protect a quarterback who is attempting to pass or hand off the ball.
 Offensive linemen and fullbacks tend to do the most blocking, although wide receivers are often asked to help block on running plays and halfbacks may be asked to help block on passing plays, while tight ends perform pass blocking and run blocking if they are not running routes to receive passes.
 Overall, blocking is a skill that virtually every football player may be required to do at some point, even defensive players in the event of a turnover.

Question: Sung Jun Huh is possibly the only professional American football player of Korean descent, besides another player who was drafted in what year?
Answer: 1998