충일건설과 동우건설은 2001. 12. 22. 합병하여 충일산업을 신규 설립하고, 2003. 8. 9. 씨아이씨 주식회사를 분할 설립하였다.
Chungil E&C and Dongwoo E&C merged on December 22, 2001 to newly establish Chungil Industries, and on August 9, 2003, CIC Co., Ltd. was established separately.