Kiu was born in Yeongju, and began his footballing career at local club Young In FBC.
In January of the following year, he signed for second-tier club UD Almería,[1] after impressing with CF Palencia.
[2] Kiu was promoted to the reserves in the 2013 summer, and made his debut for the Andalusians' first team on 19 August, coming on as a late substitute for Fernando Soriano in a 2–3 La Liga home loss against Villarreal CF.
[6] Following Mérida's relegation, Kiu joined NK Istra 1961 of the Croatian First Football League in August 2018.
Having made three substitute appearances of total five minutes duration, he came back to Spain's third tier in January when he was loaned to CD El Ejido, who ended the campaign with descent.