Woo came under fire after he disappeared late last month, when the parliament delivered him an official document for the summons.

Woo, however, said he stayed low key not to avoid the investigation but to hide from journalists.

A close acquaintance of Woo said the former presidential secretary wanted to avoid reporters approaching his family members.

Parliament issued orders of accompaniment against Woo on Wednesday.

The order is issued to forcefully make a suspect or witness appear at a hearing when he or she refuses to attend without a justifiable reason.

The parliament and investigators, however, failed to deliver the order as Woo's whereabouts remained unknown.

Woo is charged with delinquency of duties for remaining silent while being aware of Choi's interference in state affairs. (Yonhap)