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Putting the past behind them, three friends Jae-yi, Yoo-jung and Hae-mi lead successful lives, until a tragedy happens right before them.

The plan falls apart with Yoo-na’s arrival. Yoo-na makes a tempting proposal, but Jae-yi does not trust her.

Jae-yi finds an important clue that could reveal the truth of the incident 10 years ago. She also learns about Yoo-na’s secret.

Jae-yi attempts to retaliate against Yoo-na. At Yoo-jung’s wedding, Jae-yi receives a message that leaves her in fear and disbelief.

Jae-yi decides to join hands with Yoo-na to stand up against the owner of the mask.

Yoo-na begins to waver as Je-hyuk attempts to appease her. Yoo-jung and Hae-mi turn their backs against Jae-yi.

Jae-yi tries to find another way to locate the headquarters of the mask. Yoo-na sets Jae-yi up.

Jae-yi musters the courage to confess about the incident 10 years ago, to expose Je-hyuk’s true colours and protect her friends, but things do not go as planned.

After finding out that Jae-yi has retrieved confidential documents from the Angels Club, Je-hyuk is forced to make a daring choice.

A desperate Yoo-na confronts Yoo-jung and causes a ruckus at the hospital. Yeon-ah comes up with a bold plan to save Jae-yi who is in danger.

Je-hyuk wakes up to an unexpected situation. Just as they thought everything was over, the four friends receive an anonymous message.

As history repeats itself, the four friends are flustered as they hide their own secrets. Kang-hoo meets someone that he has been waiting for.

Hae-mi finds out about her mother’s betrayal. Kang-hoo admits to Jae-yi that he was the one who erased the CCTV footage.

Hae-mi goes back to her old ways. Yoo-na turns to desperate measures to save Na-na.

Kang-hoo is attacked right in front of Jae-yi's eyes. Jae-yi's friends are swayed by the lure of a new proposal related to Angel's Club.

Faced with the bare face of the mask, Jae-yi makes the final decision. Jae-yi's friends are faced with a choice between Jae-yi and the mask.