"The late chairman had asked Online Cigarettes Store USA the family to lead Hanjin Group with harmony ... yet chairman Cho Won-tae has been making management decisions not aligned with (the late chairman's) will, and is still being insincere when it comes to family discussions regarding the management of the group."
The statement added that Heather "intends to listen to the views of various shareholders and hold consultations with them Newport 100s Box to actively pursue Hanjin Group's development in accordance with the late chairman's will".
Analysts said the statement raised the possibility that Heather Cho could try to join hands with other investors to raise their stakes in group holding company Hanjin Kal.
Hanjin Kal shares soared 20% on Monday, while the broader Korean market closed flat. Korean Air and budget affiliate Jin Air also rose over 4%.
Cho Won-tae, Heather Cho and younger sister Emily Cho hold 6.46%, 6.43% and 6.42% of Hanjin Kal Cheap Newport 100s cigarettes shares respectively.
"We hope that this incident will not hurt the stability of the company's management or have a negative impact on the company's value," Hanjin Group said in a statement.