After further investigation, Shin Do Sik (Park Kang Hyun) found out that Seon Woo Yeol (Ok Taecyeon) is a vampire in "Heartbeat" episode 9.

'Heartbeat' Episode 9: Shin Do Sik Discovers Seon Woo Yeol's Identity

In "Heartbeat" episode 9, Seon Woo Yeol was shocked to know that he would die if he failed to drink Joo In Hae's blood as per Koyang Nam (Kim In Kwon).

Meanwhile, Shin Do Sik (Park Kang Hyun) discovered that Seon Woo Yeol is a vampire and started to wonder if In Hae already knew Woo Yeol's identity. However, rather than answering Do Sik's question, she tried to cover up Woo Yeol's identity.

ALSO READ: 'Heartbeat' Episode 8: Park Kang Hyun Gets Suspicious of Ok Taecyeon's Identity

On the other hand, Na Hae Won (Yoon So Hee) visited the guest house to celebrate the opening of the business. Hae Won revealed his feelings for Woo Yeol to Jo In Hae and asked for advice on what to do next.

Woo Yeol, who just entered the mansion said that he had no intention of meeting anyone, and was frustrated when he realized that it was not easy to make Joo In Hae fall in love, so he can finally do his mission.

Na Hae Won Expresses Her Feelings for Seon Woo Yeol

To make matters worse, Na Hae Won asked Woo Yeol for a favor to accompany her in driving, and they ended up spending time together. She got curious about him and wanted to know him more. She instantly conveyed her feelings and the half-human and half-vampire was surprised when Hae Won hugged her affectionately.

He then confronted her and said to wait a little longer because he still had something to solve. The following day, Hae Won ordered Ri Man Hwi (Baek Seo Hoo) to conduct a background check on Seon Woo Yeol.

Man Hwi sneaked into Joo In Hae and Seon Woo Yeol's mansion and found a scroll of Yoo Ha Seon (Yoon So Hee), who looked exactly like Na Hae Won, which caused tension in the progress of the story.

Joo In Hae Gets Jealous of Seon Woo Yeol & Na Hae Won's Closeness

Afterward, Joo In Hae felt jealous, as Woo Yeol began to be close to Hae Won and was upset by her housemate's cold response. The two then had an emotional fight, which led Woo Yeol to blame In Hae for ruining his mission to become a full human.

As the story continued, Seon Woo Yeol learned that Joo Dong Il (Seo Hyun Chul), a descendant of Hae In's father and butler (Park Chul Min) is currently missing. He then expressed pity for Hae In's situation and made a sincere apology for their recent fight.

As they get close to each other, Joo In Hae made Woo Yeol flutter after saying that she will help him to become a full human.

Meanwhile, Do Sik on the other hand, continued to watch Woo Yeol from afar and discovered that he might be the answer to cure his disease.

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What can you say about "Heartbeat" episode 9? Share your thoughts/replies in the comments!

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Shai Collins wrote this.