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Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Leo, a young Japanese college student, travels to Hawaii and eventually falls in love with Maria, an older Japanese-Caucasion woman.

Action-packed mystery thriller.
This one's got some romance as well (tearjerkers).
Han Hyo Joo ??

Both are chinese dramas.
Serendipity is more focused on romance than 19th floor
Both of the story bases are similar - in both shows they visit different worlds (VR games/books) with different settings, solve problems and find out about mysteries.
19th floor has more characterswho travel to different worlds.