'Yohan' is the 4th son of the Hellhound mafia leader. Yohan who holds an abnormal abilities due to an incident in a young age related to his ancestors, decide to reach his dream of becoming a doctor while hiding his identity as a Mafia member.
'Rain' is the only son of the red-circle Mafia leader, a rival/enemy to the Hellhound, who became emotionally interested in both yet the same person Yohan and 4th (Fourth)
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Link for the Volume 001 :
https://www.webnovel.com/book/the-4th-hellhound-%7Bbl%7D_30287362505053905