A prominent K-pop music video director was charged on Sunday as part of a corruption scandal rocking South Korea and engulfing President Park Geun-Hye.

Prosecutors say Cha Eun-Taek used his ties to a confidante of Park to win lucrative projects from state agencies and private firms. It comes after an estimated 1.5 million people rallied in Seoul on Saturday in the fifth week of protests against President Park Geun-hye.

Three major opposition parties sent delegates to attend the protest, and said they would jointly submit a draft impeachment proposal to the Parliament next month. Oppositions say 40 MPs from the ruling Saenuri Party support the proposal.