Kai Ko and Elva Hsiao enjoy a date in the air

Taiwanese celebrity couple Kai Ko and Elva Hsiao are now more open about their relationship since the former declared his love for the songstress during an interview in Taiwanese variety show, Here Comes Kang Xi.

Besides posting words of encouragement to each other via their microblogs, Elva also reserved a movie theatre to support her beau's latest movie When a Wolf Falls In Love With a Sheep with her family and friends last month.

Kai, who is currently filming his upcoming movie Xiao Shi Dai in Shanghai, was spotted boarding a flight to Taiwan on Sunday.

Coincidentally, Elva who was supposed to be in Yi Chang (a city in China's capital, Wuhan) for a work assignment, appeared at the Shanghai airport and returned to Taiwan on the same flight which sparked dating speculations between the duo again.

As Kai had to attend a movie promotional event in Singapore on Monday, it was believed that he chose to spend two hours "dating" Elva on the plane rather than to travel directly to Singapore from Shanghai.

An insider also revealed that the 33-year-old songbird had intentionally arranged to return to Taiwan together with her rumoured boyfriend. The pair left individually as soon as the plane landed in Taiwan.

Elva's manager, Jiang Cheng Jin, denied the rumours and explained, "We only found out that Kai was also on the same flight when we met Amber Guo's (Kai's co-star in Xiao Shi Dai) manager."

Cheng Jin further clarified that Kai and Elva were seated respectively on the first and last row of the business class, and both of them "just greeted each other".

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Kai Ko confesses his love for Elva Hsiao