By Joyce Lee SEOUL (Reuters) -South Korea's Constitutional Court will hold its first hearing on Friday in the case of President Yoon Suk Yeol, after parliament impeached him over his short-lived martial law decree on Dec.

South Korea’s main opposition party said Tuesday it will seek to impeach acting leader Han Duck-soo after he missed an opposition-set deadline to approve independent investigations into impeached President Yoon Suk Yeol and his wife.

South Korea’s main liberal opposition party said Tuesday it will seek to impeach acting leader Han Duck-soo, as Seoul grapples with the turmoil set off when impeached President Yoon Suk Yeol made a short-lived declaration of martial law.

South Korea has become a “super-aged” society with one in five people aged 65 or older, official data showed Tuesday, underscoring the country’s deepening demographic crisis.