Takane no Hana (2018)

Both of them talk about japanese traditions and also about learning the arts and there's also romancr.

Toge Nayuta is a professional Shogi player. Her games last for about 10 hours. She also thinks carefully about what she will eat during breaks in the game. Her choices in meals helps her win games.
~~Based on the manga series "Shogi Meshi" by Nagisa Matsumoto

the boy is clumsy, but the girls is smart n broken heart, seek someone who can never betray them
birth secret involved child

This story follows the sweet and “overprotective” newly-wed life between Someya Yukito, a young master of an established inn in Asakusa, and Tsuruoka Io, a pure-hearted female apprentice training to be a chef. Tsuruoka was in the depths of despair until she found solace in the sweet konpeito candy given to her by Someya. Since then, she has earnestly cherished her feelings while training as a chef. Yukito’s affectionate words and actions reserved only Tsuruoka, along with his excessively cute jealousy, create an irresistibly heart-fluttering devotion with a charming gap that’s impossible to resist!

Yuki Rio, the daughter of an old, prestigious family in Kyoto with over 1,000 years of history, enters into an arranged marriage at the age of 16 with a man she’s never met. Her husband is Takamine Masatomo, a handsome CEO in the IT industry. Every year on her birthday, she would receive 50 million yen, making their relationship one based solely on money. One day, after ten years had passed with no contact, Rio decided to move to Tokyo. She asks her husband, whom she’s meeting for the first time, for a divorce. On the other hand, Takamine finds himself unexpectedly attracted to Rio and doesn’t want a divorce. Thus begins a romantic battle between a wife who wants a divorce and a husband who refuses to let her go.

Naohito Kazama is an ordinary bicycle shop owner. Their backgrounds are completely different, but they fall in love

Both dramas written by the same person. While they have different stories, the overall emotional feeling is a bit similar in my opinion. In both, the male leads live in lower life due to family circumstances. And on every episode, new plot twist will be revealed. The difference is that in BNNH the plot twists are more shocking/surprising, while TNH's are more subtle.

The Landlady's room is a Hulu original that will shed some light behind the inner workings of Kyoko, the Landlady of Kougetsuan, and mother to Tsubaki, as she tries to take down Nao.

Kyoko is a woman of the high society and the worst kind of enemy one could ever wish upon their foes. She has spent her life raising her only son, Tsubaki, to be the successor of Kougetsuan. In this original Hulu series, we will learn more about her dark schemes as we enter The Landlady's Room. It may even be possible to make sense of the disturbing hymns she sings and unravel the mystery behind the murder of the Landlord 15 years ago.

Both dramas talk about Japanese traditions and having to inherit the family business. Also, both have romance involved.

In Kyoto, soon after the war, Ichika strives to save her family's long established ryoten restaurant from financial crisis. In order to do so, she marries Yamaguchi Amane, who is 15 years younger, in a marriage of convenience

Very similar storyline about a rich woman with a high status and a poor ordinary man. Watching Takane no Hana was very nostalgic and brought back fond memories of when I watched Celeb to Binbo Taro many years ago.

Similar premise of an inexperienced guy falling in love with a beautiful woman who is completely out of his league, as he get his first taste of love and heartbreaks.

Although Densha Otoko is more comedic, Takane no Hana is more serious, due to the overall plot of her family's story of succession and inheritance.

Both deal with two very different people finding a balance with one another. Has more romance though and is centered around young teens high school romance.