Seon Woo and Jang Il form a fast friendship, but when Seon Woo's father commits suicide, their friendship becomes marred with dark secrets.

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Seon Woo tries to solve the mystery around his father's death. Jang Il's father tries to cover up his tracks.

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Seon Woo and Jang Il both get closer to the truth about the death of Seon Woo's father, which drives them apart.

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Seon Woo must live with a heavy conscience and fears the day Jang Il might regain consciousness.

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Seon Woo struggles to function without eyesight, but he regains his memories - including those of Jang Il's betrayal.

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Ji On and Seon Woo are reunited at a school for the blind and Jang Il grows increasingly frustrated.

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The relationship between Ji On and Seon Woo continues to grow and Jang Il's father starts to receive blackmail letters.

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Ji On's relationship with Seon Woo become complicated just as Moon Tae Ju steps into the picture to help his son.

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Seon Woo must decide if he will break ties with his friends to leave with Moon Tae Ju, who claims to be his father.

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After an extended stay abroad, Seon Woo is back in Korea as a new man, about to give his childhood friends a huge shock.

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Jin No Sik and Jang Il both must tread carefully after learning the truth about David Kim's identity.

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Seon Woo set his plan for revenge in motion and So Mi reveals to Jang Il a shocking secret that changes everything.

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So Mi conspires to make Jang Il hers while Seon Woo moves forward with his plan to force Jang Il into an awkward position.

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So Mi and her father are called in for questioning surrounding the investigation of Jin No Sik.

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Lee Yong Bae must testify as a witness for the murder of Sun Woo's father.

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Jang Il gives Sun Woo one last chance to ask for forgiveness before he launches his plan to destroy his life.

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Sun Woo makes it painfully clear to all those involved in the death and cover up of his father that revenge is imminent.

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Sun Woo receives the final pieces of the puzzle surrounding the identity of his biological father. Meanwhile, Jang Il's father breaks under the pressure.

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Sun Woo devises a plot to oust Jin No Shik out of the company completely, while Jang Il breaks down as he sees his life falling apart.

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Sun Woo's symphony of revenge reaches its final crescendo in this shocking finale filled with revelations and reconciliations.

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