Eun Soo Hyun (Kim Nam Joo) discovered the truth about her son's death and determined to expose Kim Joon (Park Hyuk Kwon) in "Wonderful World" Episode 13.

'Wonderful World' Episode 13: Kwon Sun Yul Feels Guilty of Hurting Eun Soo Hyun

The episode began showing the real scenario of Gun Woo's accident. It was Kim Joon (Park Hyuk Kwon) who hit him and Kwon Ji Woong took the blame in exchange for Kwon Sun Yul's transplant.

While listening to the audio where everything is revealed, Eun Soo Hyun breaks down in pain, hearing her son's misery.

Kwon Sun Yul, who also heard the recording, was shocked and was in guilt and pain for what his father did to save him. He finally understood his mother's sympathy towards Soo Hyun. He left Soo Hyun's house without a word and with tears in his eyes.

Elsewhere, Yu Ri is worried for Go Eun after the incident and contemplates telling Soo Hyun about it, but Oh Go Eun wishes to keep it hidden from her daughter.

Kim Joon Threatens Kang Su Ho

Meanwhile, Sun Yul was sinking in guilt while Eun Soo Hyun cried for her child all night long. While they tried to clear up their minds, Kim Joon warned Su Ho that his wife was going to be in danger if she did something bad.

Kang Su Ho didn't know that Soo Hyun had already approached the police to re-open Gun Woo's case with Kim Joon as the primary suspect. The following day, Go Eun went to the hospital where she was diagnosed with Alzheimer's, while Sun Yul visited Gun Woo's grave and promised the child that he would protect his mom, Eun Soo Hyun.

Later, the two crossed paths. Soo Hyun told Sun Yul to return home only to know that he also heard the recording of Gun Woo's accident. Soo Hyun understood what was happening and as he apologized to her, Soo Hyun told him that it was not his fault.

They sympathized with each other and resolved the guilt and pain between them.

Eun Soo Hyun Uncovers Truth About Gun Woo's Incident Involving Kim Joon

Meanwhile, Su Ho was surprised to know that Kim Joon and his wife were both holding a press conference.

Kim Joo continued with his election propaganda, while Soo Hyun tried to reveal the truth about her son's incident. Amid the media chaos, Su Ho returned home and searched for Gun Woo's tablet as he wanted to save Soo Hyun's life against Kim Joon.

He gave the tablet to Kim Joon. While no news of Soo Hyun's press con is found online, she was aware of what was happening and determined to reveal the truth. She was surprised when she found Gun Woo's tablet missing.

So Hyun discovered that Su Ho had taken it. Her husband explained that he only wanted her safety, but she got more frustrated by him. She looked into other ways to reveal Kim Joon's deeds.

Elsewhere, Sun Yul visited Go Eun with an apologetic heart. Before he secretly leaves, Go Eun calls him inside for food. She told him to move on from his pain and not harm Soo Hyun anymore. The two had a heartfelt conversation.

Meanwhile, Kwon Sun Yul's friends tried to get signatures and statements from other victims of the Junseong Foundation which is run by Kim Joon.

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Shai San Miguel wrote this.