"The Brave Yong Soo Jung" it's a drama about Soo Jung, who lost her parents and her home at the same time. Fortunately she meets Jang Won, who became her adopted father and helped her grow up to be a bright woman. Her life is also entangled with Eui Ju and his mother.
Time passes and Soo Jung becomes a sales announcer. There she meets Woo Jin, a cold man who doesn't let anyone come in to close. The two eventually fall in love. In between them, there's Eui Ju, who's reunited with Yoo Jung as an adult and finds out that Woo Jin is his brother. Both of the brothers like Soo Jung, but she likes Woo Jin and also wants to use him as a way to make Hye Ra suffer, since Hye Ra and her mother were the people that stole Soo Jung's money and made her mother died.

Soo Jung's adopted father unfortunately dies by the hands of Woo Jin, Hye Ra and Kyung Hwa, she swears to take her revenge and comes back a different woman. Now, Woo Jin is married to Hye Ra and Soo Jung does everything to break them apart. Eventually Soo Jung and Eui Ju become a couple and they join hands to make the evil people pay for their crimes.

After this, the drama loses it's direction. Eui Ju learns that he has cancer and the couple's happiness is totally gone at this moment. Actually they didn't even had a moment to be a real couple, now that Eui Ju and Soo Jung are married, he's going to die? It's not fair. We only see Eui Ju suffering from the side affects of the tumor and trying to hide the truth from Soo Jung, who eventually finds out.
Yes, in the end Eui Ju is alive, but I think it's because the writers didn't have the courage to kill off his character and actually it would be better if they did that. This whole thing with him being missing and the amnesia, it was just lazy writing. It would made more sense if Eui Ju became health again or if he died.

Woo Jin was the best character, his transformation is one of the best things that happened in the drama. For him to realize that he was used and lied to his entire life, all because of his so called "mother". Woo Jin decided to become a new person, made Kyung Hwa pay and even used Hye Ra in the process.
Until the end I was hoping that Soo Jung's birth father would show up alive, because we actually didn't see him dying in the beginning, even Soo Jung's mother only said he was missing. I think the drama lost a really interesting plot twist with this.

The story is good and so are the characters, the development was going great, but the drama became confused basically at the middle and went downhill from there.