S-Oil Corp. on Friday reported its second-quarter net loss of 21.3 billion won (US$15.4 million), remaining in the red compared with a year ago.The company said in a regulatory filing that operating profit for the April-June period rose 341.1 percent on-year to 160.6 billion won. Revenue increased 22.4 percent to 9.57 trillion won.Source: Yonhap News Agency